1 // net_gui.hxx -- defines a simple subset I/O interface to the flight
2 // dynamics model variables
4 // Written by Curtis Olson - curt@flightgear.com, started January 2002.
6 // This file is in the Public Domain, and comes with no warranty.
14 #include <simgear/misc/stdint.hxx>
16 // NOTE: this file defines an external interface structure. Due to
17 // variability between platforms and architectures, we only used fixed
18 // length types here. Specifically, integer types can vary in length.
19 // I am not aware of any platforms that don't use 4 bytes for float
20 // and 8 bytes for double.
23 const uint32_t FG_NET_GUI_VERSION = 8;
26 // Define a structure containing the top level flight dynamics model
39 // Note: align fields properly and manually to avoid incompatibilities
40 // between 32bit and 64bit CPUs. Make sure that each field is already
41 // placed on an offset which is a multiple of the size of its data
42 // type, i.e. uint32/float need to have on offset of 4, doubles need
43 // an offset of 8. This guarantees that compilers will _not_ add
44 // CPU-specific padding bytes. Whenever in doubt about padding rules,
45 // check "data structure alignment" in Wikipedia/Google :).
47 uint32_t version; // increment when data values change
48 uint32_t padding1; // 4 padding bytes, so the next (64bit) var is aligned to 8
50 // Positions (note: offset for these doubles is already aligned to 8 - to avoid architecture specific alignments)
51 double longitude; // geodetic (radians)
52 double latitude; // geodetic (radians)
54 float altitude; // above sea level (meters)
55 float agl; // above ground level (meters)
56 float phi; // roll (radians)
57 float theta; // pitch (radians)
58 float psi; // yaw or true heading (radians)
62 float climb_rate; // feet per second
65 uint32_t num_tanks; // Max number of fuel tanks
66 float fuel_quantity[FG_MAX_TANKS];
69 uint32_t cur_time; // current unix time
70 // FIXME: make this uint64_t before 2038
71 uint32_t warp; // offset in seconds to unix time
72 float ground_elev; // ground elev (meters)
75 float tuned_freq; // currently tuned frequency
76 float nav_radial; // target nav radial
77 uint32_t in_range; // tuned navaid is in range?
78 float dist_nm; // distance to tuned navaid in nautical miles
79 float course_deviation_deg; // degrees off target course
80 float gs_deviation_deg; // degrees off target glide slope
84 #endif // _NET_GUI_HXX